If you can see the content in the challenge requirements it is given as

Clone the DreamHouse Git repository to get the source files for the DreamHouse app.Using the DreamHouse source, create an unlocked package in your Dev Hub with the name th-dreamhouseand description, My DreamHouse Package.Create version 1.0 of the My DreamHouse Package.Create a scratch org and install version 1.0 in it.Use the Salesforce CLI to install version 1.0 of the DreamHouse package in the your Trailhead Playground org.